The work done in carrying a charge Q(1) ...

The work done in carrying a charge `Q_(1)` once round a circle of radius `R` with a charge `Q_(2)` at the centre is

`Qq(4piepsi_(0)r^(2))`

`Qq(4piepsi_(0)r)`

zero

`Qq^(2)(4piepsi_(0)r)`

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